Hi,

I would recommend:

1. Creating a Form
	form := Form extent: 100 at 100

2. Creating a canvas on the Form
	can := FormCanvas on: form

and then using the drawPolygon:... methods in Canvas.  This should be
both easier and faster than your current plan.

Joshua

On Mon, Nov 19, 2001 at 08:44:51PM -0800, Hsin-Hao Yu wrote:
> 
> Hello! This is an extremely newbie question. I just started to use
> Squeak to construct visual stimuli for some brain imaging experiments,
> but I am quite intimidated by Squeak's drawing primitives, and the lack
> of documentation. 
> 
> The problem is simple: I want to draw a bunch of polygons filled
> with colors, but it has to be drawn as fast as possible, since
> timing is critical. What is the best way to do this in Squeak?
> 
> My plan is:
> 1. create a Form
> 2. use the drawLine:from:to:clippingBox:rule:fillColor method
>    to draw the edges of the polgons.
> 3. use of of the methods in the "filling" category of the Form class
>    to paint color to the polygon
> 
> I am stucked by two problems:
> 1. I have no idea what the arguments to "drawLine:from:to:clippingBox:
>    rule:fillColor" should be. What is a "source"? what rule?
> 2. I want to choose a filling algorithm that is as efficient as possible
>    for simply polygons.
> 
> Would someone be so kind of help a beginner? In return to the community
> I would share the result when it is finished, as an example of using the
> Form class. Thanx a lot.
> 
> 
>